feat(frontend): add API client, layout, and routing

- Create Axios-based API client with sources, jobs, and dashboard endpoints
- Add responsive Layout component with navigation sidebar
- Set up React Router with Dashboard, Backups, and Settings routes
- Configure TanStack Query provider with default options
- Use lucide-react for navigation icons

frontend/node_modules/lucide-react/dist/esm/icons/file-clock.js

@@ -0,0 +1,24 @@
+/**
+ * @license lucide-react v0.303.0 - ISC
+ *
+ * This source code is licensed under the ISC license.
+ * See the LICENSE file in the root directory of this source tree.
+ */
+
+import createLucideIcon from '../createLucideIcon.js';
+
+const FileClock = createLucideIcon("FileClock", [
+  [
+    "path",
+    {
+      d: "M16 22h2c.5 0 1-.2 1.4-.6.4-.4.6-.9.6-1.4V7.5L14.5 2H6c-.5 0-1 .2-1.4.6C4.2 3 4 3.5 4 4v3",
+      key: "9lo3o3"
+    }
+  ],
+  ["polyline", { points: "14 2 14 8 20 8", key: "1ew0cm" }],
+  ["circle", { cx: "8", cy: "16", r: "6", key: "10v15b" }],
+  ["path", { d: "M9.5 17.5 8 16.25V14", key: "1o80t2" }]
+]);
+
+export { FileClock as default };
+//# sourceMappingURL=file-clock.js.map